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adminlib.php
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<?php
/**
* adminlib.php - Contains functions that only administrators will ever need to use
*
* @author Martin Dougiamas and many others
* @version $Id$
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package moodlecore
*/
/// Add required XMLDB constants
require_once($CFG->libdir.'/xmldb/xmldb_constants.php');
/// Add required XMLDB DB classes
require_once($CFG->libdir.'/xmldb/xmldb_object.php');
require_once($CFG->libdir.'/xmldb/xmldb_file.php');
require_once($CFG->libdir.'/xmldb/xmldb_structure.php');
require_once($CFG->libdir.'/xmldb/xmldb_table.php');
require_once($CFG->libdir.'/xmldb/xmldb_field.php');
require_once($CFG->libdir.'/xmldb/xmldb_key.php');
require_once($CFG->libdir.'/xmldb/xmldb_index.php');
require_once($CFG->libdir.'/xmldb/xmldb_statement.php');
/// Add other libraries
require_once($CFG->libdir.'/xmlize.php');
function upgrade_main_savepoint($result, $version) {
global $CFG;
if ($result) {
if ($CFG->version >= $version) {
// something really wrong is going on in main upgrade script
print_error('cannotdowngrade', 'debug', '', array($CFG->version, $version));
}
set_config('version', $version);
} else {
notify ("Upgrade savepoint: Error during main upgrade to version $version");
}
}
function upgrade_mod_savepoint($result, $version, $modname) {
global $DB;
if (!$module = $DB->get_record('modules', array('name'=>$modname))) {
print_error('modulenotexist', 'debug', '', $modname);
}
if ($result) {
if ($module->version >= $version) {
// something really wrong is going on in upgrade script
print_error('cannotdowngrade', 'debug', '', array($module->version, $version));
}
$module->verions = $version;
$DB->update_record('modules', $module);
} else {
notify ("Upgrade savepoint: Error during mod upgrade to version $version");
}
}
function upgrade_plugin_savepoint($result, $version, $type, $dir) {
//TODO
}
function upgrade_backup_savepoint($result, $version) {
//TODO
}
function upgrade_blocks_savepoint($result, $version, $type) {
//TODO
}
/**
* Delete all plugin tables
* @name string name of plugin, used as table prefix
* @file string path to install.xml file
* @feedback boolean
*/
function drop_plugin_tables($name, $file, $feedback=true) {
global $CFG, $DB;
// first try normal delete
if ($DB->get_manager()->delete_tables_from_xmldb_file($file)) {
return true;
}
// then try to find all tables that start with name and are not in any xml file
$used_tables = get_used_table_names();
$tables = $DB->get_tables();
/// Iterate over, fixing id fields as necessary
foreach ($tables as $table) {
if (in_array($table, $used_tables)) {
continue;
}
// found orphan table --> delete it
if ($DB->get_manager()->table_exists($table)) {
$xmldb_table = new xmldb_table($table);
$DB->get_manager()->drop_table($xmldb_table);
}
}
return true;
}
/**
* Returns names of all known tables == tables that moodle knowns about.
* @return array of lowercase table names
*/
function get_used_table_names() {
$table_names = array();
$dbdirs = get_db_directories();
foreach ($dbdirs as $dbdir) {
$file = $dbdir.'/install.xml';
$xmldb_file = new xmldb_file($file);
if (!$xmldb_file->fileExists()) {
continue;
}
$loaded = $xmldb_file->loadXMLStructure();
$structure =& $xmldb_file->getStructure();
if ($loaded and $tables = $structure->getTables()) {
foreach($tables as $table) {
$table_names[] = strtolower($table->name);
}
}
}
return $table_names;
}
/**
* Returns list of all directories where we expect install.xml files
* @return array of paths
*/
function get_db_directories() {
global $CFG;
$dbdirs = array();
/// First, the main one (lib/db)
$dbdirs[] = $CFG->libdir.'/db';
/// Now, activity modules (mod/xxx/db)
if ($plugins = get_list_of_plugins('mod')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/mod/'.$plugin.'/db';
}
}
/// Now, assignment submodules (mod/assignment/type/xxx/db)
if ($plugins = get_list_of_plugins('mod/assignment/type')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/mod/assignment/type/'.$plugin.'/db';
}
}
/// Now, question types (question/type/xxx/db)
if ($plugins = get_list_of_plugins('question/type')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/question/type/'.$plugin.'/db';
}
}
/// Now, backup/restore stuff (backup/db)
$dbdirs[] = $CFG->dirroot.'/backup/db';
/// Now, block system stuff (blocks/db)
$dbdirs[] = $CFG->dirroot.'/blocks/db';
/// Now, blocks (blocks/xxx/db)
if ($plugins = get_list_of_plugins('blocks', 'db')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/blocks/'.$plugin.'/db';
}
}
/// Now, course formats (course/format/xxx/db)
if ($plugins = get_list_of_plugins('course/format', 'db')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/course/format/'.$plugin.'/db';
}
}
/// Now, enrolment plugins (enrol/xxx/db)
if ($plugins = get_list_of_plugins('enrol', 'db')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/enrol/'.$plugin.'/db';
}
}
/// Now admin report plugins (admin/report/xxx/db)
if ($plugins = get_list_of_plugins($CFG->admin.'/report', 'db')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/'.$CFG->admin.'/report/'.$plugin.'/db';
}
}
/// Now quiz report plugins (mod/quiz/report/xxx/db)
if ($plugins = get_list_of_plugins('mod/quiz/report', 'db')) {
foreach ($plugins as $plugin) {
$dbdirs[] = $CFG->dirroot.'/mod/quiz/report/'.$plugin.'/db';
}
}
/// Local database changes, if the local folder exists.
if (file_exists($CFG->dirroot . '/local')) {
$dbdirs[] = $CFG->dirroot.'/local/db';
}
return $dbdirs;
}
/**
* Upgrade plugins
*
* @uses $CFG
* @param string $type The type of plugins that should be updated (e.g. 'enrol', 'qtype')
* @param string $dir The directory where the plugins are located (e.g. 'question/questiontypes')
* @param string $return The url to prompt the user to continue to
*/
function upgrade_plugins($type, $dir, $return) {
global $CFG, $interactive, $DB;
/// Let's know if the header has been printed, so the funcion is being called embedded in an outer page
$embedded = defined('HEADER_PRINTED');
$plugs = get_list_of_plugins($dir);
$updated_plugins = false;
$strpluginsetup = get_string('pluginsetup');
foreach ($plugs as $plug) {
$fullplug = $CFG->dirroot .'/'.$dir.'/'. $plug;
unset($plugin);
if (is_readable($fullplug .'/version.php')) {
include_once($fullplug .'/version.php'); // defines $plugin with version etc
} else {
continue; // Nothing to do.
}
$newupgrade = false;
if (is_readable($fullplug . '/db/upgrade.php')) {
include_once($fullplug . '/db/upgrade.php'); // defines new upgrading function
$newupgrade = true;
}
if (!isset($plugin)) {
continue;
}
if (!empty($plugin->requires)) {
if ($plugin->requires > $CFG->version) {
$info = new object();
$info->pluginname = $plug;
$info->pluginversion = $plugin->version;
$info->currentmoodle = $CFG->version;
$info->requiremoodle = $plugin->requires;
if (!$updated_plugins && !$embedded) {
print_header($strpluginsetup, $strpluginsetup,
build_navigation(array(array('name' => $strpluginsetup, 'link' => null, 'type' => 'misc'))), '',
upgrade_get_javascript(), false, ' ', ' ');
}
upgrade_log_start();
notify(get_string('pluginrequirementsnotmet', 'error', $info));
$updated_plugins = true;
continue;
}
}
$plugin->name = $plug; // The name MUST match the directory
$pluginversion = $type.'_'.$plug.'_version';
if (!isset($CFG->$pluginversion)) {
set_config($pluginversion, 0);
}
if ($CFG->$pluginversion == $plugin->version) {
// do nothing
} else if ($CFG->$pluginversion < $plugin->version) {
if (!$updated_plugins && !$embedded) {
print_header($strpluginsetup, $strpluginsetup,
build_navigation(array(array('name' => $strpluginsetup, 'link' => null, 'type' => 'misc'))), '',
upgrade_get_javascript(), false, ' ', ' ');
}
$updated_plugins = true;
upgrade_log_start();
print_heading($dir.'/'. $plugin->name .' plugin needs upgrading');
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(true);
}
@set_time_limit(0); // To allow slow databases to complete the long SQL
if ($CFG->$pluginversion == 0) { // It's a new install of this plugin
/// Both old .sql files and new install.xml are supported
/// but we priorize install.xml (XMLDB) if present
if (file_exists($fullplug . '/db/install.xml')) {
$DB->get_manager()->install_from_xmldb_file($fullplug . '/db/install.xml'); //New method
}
$status = true;
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(false);
}
/// Continue with the instalation, roles and other stuff
if ($status) {
/// OK so far, now update the plugins record
set_config($pluginversion, $plugin->version);
/// Install capabilities
if (!update_capabilities($type.'/'.$plug)) {
print_error('cannotsetupcapforplugin', '', '', $plugin->name);
}
/// Install events
events_update_definition($type.'/'.$plug);
/// Run local install function if there is one
if (is_readable($fullplug .'/lib.php')) {
include_once($fullplug .'/lib.php');
$installfunction = $plugin->name.'_install';
if (function_exists($installfunction)) {
if (! $installfunction() ) {
notify('Encountered a problem running install function for '.$module->name.'!');
}
}
}
notify(get_string('modulesuccess', '', $plugin->name), 'notifysuccess');
} else {
notify('Installing '. $plugin->name .' FAILED!');
}
} else { // Upgrade existing install
/// Run de old and new upgrade functions for the module
$newupgrade_function = 'xmldb_' . $type.'_'.$plugin->name .'_upgrade';
/// Then, the new function if exists and the old one was ok
$newupgrade_status = true;
if ($newupgrade && function_exists($newupgrade_function)) {
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(true);
}
$newupgrade_status = $newupgrade_function($CFG->$pluginversion);
} else if ($newupgrade) {
notify ('Upgrade function ' . $newupgrade_function . ' was not available in ' .
$fullplug . '/db/upgrade.php');
}
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(false);
}
/// Now analyze upgrade results
if ($newupgrade_status) { // No upgrading failed
// OK so far, now update the plugins record
set_config($pluginversion, $plugin->version);
if (!update_capabilities($type.'/'.$plug)) {
print_error('cannotupdateplugincap', '', '', $plugin->name);
}
events_update_definition($type.'/'.$plug);
notify(get_string('modulesuccess', '', $plugin->name), 'notifysuccess');
} else {
notify('Upgrading '. $plugin->name .' from '. $CFG->$pluginversion .' to '. $plugin->version .' FAILED!');
}
}
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
echo '<hr />';
}
} else {
upgrade_log_start();
print_error('cannotdowngrade', 'debug', '', array($CFG->pluginversion, $plugin->version));
}
}
upgrade_log_finish();
if ($updated_plugins && !$embedded) {
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
print_continue($return);
print_footer('none');
die;
} else if (CLI_UPGRADE && ($interactive > CLI_SEMI )) {
console_write(STDOUT,'askcontinue');
if (read_boolean()){
return ;
}else {
console_write(STDERR,'','',false);
}
}
}
}
/**
* Find and check all modules and load them up or upgrade them if necessary
*
* @uses $CFG
* @param string $return The url to prompt the user to continue to
* @todo Finish documenting this function
*/
function upgrade_activity_modules($return) {
global $CFG, $interactive, $DB;
if (!$mods = get_list_of_plugins('mod') ) {
print_error('nomodules', 'debug');
}
$updated_modules = false;
$strmodulesetup = get_string('modulesetup');
foreach ($mods as $mod) {
if ($mod == 'NEWMODULE') { // Someone has unzipped the template, ignore it
continue;
}
$fullmod = $CFG->dirroot .'/mod/'. $mod;
unset($module);
if ( is_readable($fullmod .'/version.php')) {
include_once($fullmod .'/version.php'); // defines $module with version etc
} else {
notify('Module '. $mod .': '. $fullmod .'/version.php was not readable');
continue;
}
$newupgrade = false;
if ( is_readable($fullmod . '/db/upgrade.php')) {
include_once($fullmod . '/db/upgrade.php'); // defines new upgrading function
$newupgrade = true;
}
if (!isset($module)) {
continue;
}
if (!empty($module->requires)) {
if ($module->requires > $CFG->version) {
$info = new object();
$info->modulename = $mod;
$info->moduleversion = $module->version;
$info->currentmoodle = $CFG->version;
$info->requiremoodle = $module->requires;
if (!$updated_modules) {
print_header($strmodulesetup, $strmodulesetup,
build_navigation(array(array('name' => $strmodulesetup, 'link' => null, 'type' => 'misc'))), '',
upgrade_get_javascript(), false, ' ', ' ');
}
upgrade_log_start();
notify(get_string('modulerequirementsnotmet', 'error', $info));
$updated_modules = true;
continue;
}
}
$module->name = $mod; // The name MUST match the directory
include_once($fullmod.'/lib.php'); // defines upgrading and/or installing functions
if ($currmodule = $DB->get_record('modules', array('name'=>$module->name))) {
if ($currmodule->version == $module->version) {
// do nothing
} else if ($currmodule->version < $module->version) {
/// If versions say that we need to upgrade but no upgrade files are available, notify and continue
if (!$newupgrade) {
notify('Upgrade file ' . $mod . ': ' . $fullmod . '/db/upgrade.php is not readable');
continue;
}
if (!$updated_modules) {
print_header($strmodulesetup, $strmodulesetup,
build_navigation(array(array('name' => $strmodulesetup, 'link' => null, 'type' => 'misc'))), '',
upgrade_get_javascript(), false, ' ', ' ');
}
upgrade_log_start();
print_heading($module->name .' module needs upgrading');
/// Run de old and new upgrade functions for the module
$newupgrade_function = 'xmldb_' . $module->name . '_upgrade';
/// Then, the new function if exists and the old one was ok
$newupgrade_status = true;
if ($newupgrade && function_exists($newupgrade_function)) {
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(true);
}
$newupgrade_status = $newupgrade_function($currmodule->version, $module);
} else if ($newupgrade) {
notify ('Upgrade function ' . $newupgrade_function . ' was not available in ' .
$mod . ': ' . $fullmod . '/db/upgrade.php');
}
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(false);
}
/// Now analyze upgrade results
if ($newupgrade_status) { // No upgrading failed
// OK so far, now update the modules record
$module->id = $currmodule->id;
if (!$DB->update_record('modules', $module)) {
print_error('cannotupdatemod', '', '', $module->name);
}
remove_dir($CFG->dataroot . '/cache', true); // flush cache
notify(get_string('modulesuccess', '', $module->name), 'notifysuccess');
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE) {
echo '<hr />';
}
} else {
notify('Upgrading '. $module->name .' from '. $currmodule->version .' to '. $module->version .' FAILED!');
}
/// Update the capabilities table?
if (!update_capabilities('mod/'.$module->name)) {
print_error('cannotupdatemodcap', '', '', $module->name);
}
events_update_definition('mod/'.$module->name);
$updated_modules = true;
} else {
upgrade_log_start();
print_error('cannotdowngrade', 'debug', '', array($currmodule->version, $module->version));
}
} else { // module not installed yet, so install it
if (!$updated_modules) {
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
print_header($strmodulesetup, $strmodulesetup,
build_navigation(array(array('name' => $strmodulesetup, 'link' => null, 'type' => 'misc'))), '',
upgrade_get_javascript(), false, ' ', ' ');
}
}
upgrade_log_start();
print_heading($module->name);
$updated_modules = true;
// To avoid unnecessary output from the SQL queries in the CLI version
if (!defined('CLI_UPGRADE')|| !CLI_UPGRADE ) {
$DB->set_debug(true);
}
@set_time_limit(0); // To allow slow databases to complete the long SQL
/// Both old .sql files and new install.xml are supported
/// but we priorize install.xml (XMLDB) if present
if (file_exists($fullmod . '/db/install.xml')) {
$DB->get_manager()->install_from_xmldb_file($fullmod . '/db/install.xml'); //New method
$status = true;
}
if (!defined('CLI_UPGRADE') || !CLI_UPGRADE ) {
$DB->set_debug(false);
}
/// Continue with the installation, roles and other stuff
if ($status) {
if ($module->id = $DB->insert_record('modules', $module)) {
/// Capabilities
if (!update_capabilities('mod/'.$module->name)) {
print_error('cannotsetupcapformod', '', '', $module->name);
}
/// Events
events_update_definition('mod/'.$module->name);
/// Run local install function if there is one
$installfunction = $module->name.'_install';
if (function_exists($installfunction)) {
if (! $installfunction() ) {
notify('Encountered a problem running install function for '.$module->name.'!');
}
}
notify(get_string('modulesuccess', '', $module->name), 'notifysuccess');
if (!defined('CLI_UPGRADE')|| !CLI_UPGRADE ) {
echo '<hr />';
}
} else {
print_error('cannotaddmodule', '', '', $module->name);
}
} else {
print_error('cannotsetuptable', 'debug', '', $module->name);
}
}
/// Check submodules of this module if necessary
$submoduleupgrade = $module->name.'_upgrade_submodules';
if (function_exists($submoduleupgrade)) {
$submoduleupgrade();
}
/// Run any defaults or final code that is necessary for this module
if ( is_readable($fullmod .'/defaults.php')) {
// Insert default values for any important configuration variables
unset($defaults);
include($fullmod .'/defaults.php'); // include here means execute, not library include
if (!empty($defaults)) {
foreach ($defaults as $name => $value) {
if (!isset($CFG->$name)) {
set_config($name, $value);
}
}
}
}
}
upgrade_log_finish(); // finish logging if started
if ($updated_modules) {
if (!defined('CLI_UPGRADE')|| !CLI_UPGRADE ) {
print_continue($return);
print_footer('none');
die;
} else if ( CLI_UPGRADE && ($interactive > CLI_SEMI) ) {
console_write(STDOUT,'askcontinue');
if (read_boolean()){
return ;
}else {
console_write(STDERR,'','',false);
}
}
}
}
/**
* Try to obtain or release the cron lock.
*
* @param string $name name of lock
* @param int $until timestamp when this lock considered stale, null means remove lock unconditionaly
* @param bool $ignorecurrent ignore current lock state, usually entend previous lock
* @return bool true if lock obtained
*/
function set_cron_lock($name, $until, $ignorecurrent=false) {
global $DB;
if (empty($name)) {
debugging("Tried to get a cron lock for a null fieldname");
return false;
}
// remove lock by force == remove from config table
if (is_null($until)) {
set_config($name, null);
return true;
}
if (!$ignorecurrent) {
// read value from db - other processes might have changed it
$value = $DB->get_field('config', 'value', array('name'=>$name));
if ($value and $value > time()) {
//lock active
return false;
}
}
set_config($name, $until);
return true;
}
function print_progress($done, $total, $updatetime=5, $sleeptime=1, $donetext='') {
static $thisbarid;
static $starttime;
static $lasttime;
if ($total < 2) { // No need to show anything
return;
}
// Are we done?
if ($done >= $total) {
$done = $total;
if (!empty($thisbarid)) {
$donetext .= ' ('.$done.'/'.$total.') '.get_string('success');
print_progress_redraw($thisbarid, $done, $total, 500, $donetext);
$thisbarid = $starttime = $lasttime = NULL;
}
return;
}
if (empty($starttime)) {
$starttime = $lasttime = time();
$lasttime = $starttime - $updatetime;
$thisbarid = uniqid();
echo '<table width="500" cellpadding="0" cellspacing="0" align="center"><tr><td width="500">';
echo '<div id="bar'.$thisbarid.'" style="border-style:solid;border-width:1px;width:500px;height:50px;">';
echo '<div id="slider'.$thisbarid.'" style="border-style:solid;border-width:1px;height:48px;width:10px;background-color:green;"></div>';
echo '</div>';
echo '<div id="text'.$thisbarid.'" align="center" style="width:500px;"></div>';
echo '</td></tr></table>';
echo '</div>';
}
$now = time();
if ($done && (($now - $lasttime) >= $updatetime)) {
$elapsedtime = $now - $starttime;
$projectedtime = (int)(((float)$total / (float)$done) * $elapsedtime) - $elapsedtime;
$percentage = round((float)$done / (float)$total, 2);
$width = (int)(500 * $percentage);
if ($projectedtime > 10) {
$projectedtext = ' Ending: '.format_time($projectedtime);
} else {
$projectedtext = '';
}
$donetext .= ' ('.$done.'/'.$total.') '.$projectedtext;
print_progress_redraw($thisbarid, $done, $total, $width, $donetext);
$lasttime = $now;
}
}
// Don't call this function directly, it's called from print_progress.
function print_progress_redraw($thisbarid, $done, $total, $width, $donetext='') {
if (empty($thisbarid)) {
return;
}
echo '<script>';
echo 'document.getElementById("text'.$thisbarid.'").innerHTML = "'.addslashes_js($donetext).'";'."\n";
echo 'document.getElementById("slider'.$thisbarid.'").style.width = \''.$width.'px\';'."\n";
echo '</script>';
}
function upgrade_get_javascript() {
global $CFG, $SESSION;
if (!empty($SESSION->installautopilot)) {
$linktoscrolltoerrors = '<script type="text/javascript">var installautopilot = true;</script>'."\n";
} else {
$linktoscrolltoerrors = '<script type="text/javascript">var installautopilot = false;</script>'."\n";
}
$linktoscrolltoerrors .= '<script type="text/javascript" src="' . $CFG->wwwroot . '/lib/scroll_to_errors.js"></script>';
return $linktoscrolltoerrors;
}
function create_admin_user($user_input=NULL) {
global $CFG, $USER, $DB;
if (empty($CFG->rolesactive)) { // No admin user yet.
$user = new object();
$user->auth = 'manual';
$user->firstname = get_string('admin');
$user->lastname = get_string('user');
$user->username = 'admin';
$user->password = hash_internal_user_password('admin');
$user->email = 'root@localhost';
$user->confirmed = 1;
$user->mnethostid = $CFG->mnet_localhost_id;
$user->lang = $CFG->lang;
$user->maildisplay = 1;
$user->timemodified = time();
if ($user_input) {
$user = $user_input;
}
if (!$user->id = $DB->insert_record('user', $user)) {
print_error('cannotcreateadminuser', 'debug');
}
if (!$user = $DB->get_record('user', array('id'=>$user->id))) { // Double check.
print_error('invaliduserid');
}
// Assign the default admin roles to the new user.
if (!$adminroles = get_roles_with_capability('moodle/legacy:admin', CAP_ALLOW)) {
print_error('noadminrole', 'debug');
}
$sitecontext = get_context_instance(CONTEXT_SYSTEM);
foreach ($adminroles as $adminrole) {
role_assign($adminrole->id, $user->id, 0, $sitecontext->id);
}
set_config('rolesactive', 1);
// Log the user in.
$USER = get_complete_user_data('username', 'admin');
$USER->newadminuser = 1;
load_all_capabilities();
if (!defined('CLI_UPGRADE')||!CLI_UPGRADE) {
redirect("$CFG->wwwroot/user/editadvanced.php?id=$user->id"); // Edit thyself
}
} else {
print_error('cannotcreateadminuser', 'debug');
}
}
////////////////////////////////////////////////
/// upgrade logging functions
////////////////////////////////////////////////
$upgradeloghandle = false;
$upgradelogbuffer = '';
// I did not find out how to use static variable in callback function,
// the problem was that I could not flush the static buffer :-(
global $upgradeloghandle, $upgradelogbuffer;
/**
* Check if upgrade is already running.
*
* If anything goes wrong due to missing call to upgrade_log_finish()
* just restart the browser.
*
* @param string warning message indicating upgrade is already running
* @param int page reload timeout
*/
function upgrade_check_running($message, $timeout) {
global $SESSION;
if (!empty($SESSION->upgraderunning)) {
print_header();
redirect(me(), $message, $timeout);
}
}
/**
* Start logging of output into file (if not disabled) and
* prevent aborting and concurrent execution of upgrade script.
*
* Please note that you can not write into session variables after calling this function!
*
* This function may be called repeatedly.
*/
function upgrade_log_start() {
global $CFG, $upgradeloghandle, $SESSION;
if (!empty($SESSION->upgraderunning)) {
return; // logging already started
}
@ignore_user_abort(true); // ignore if user stops or otherwise aborts page loading
$SESSION->upgraderunning = 1; // set upgrade indicator
if (empty($CFG->dbsessions)) { // workaround for bug in adodb, db session can not be restarted
session_write_close(); // from now on user can reload page - will be displayed warning
}
make_upload_directory('upgradelogs');
ob_start('upgrade_log_callback', 2); // function for logging to disk; flush each line of text ASAP
register_shutdown_function('upgrade_log_finish'); // in case somebody forgets to stop logging
}
/**
* Terminate logging of output, flush all data, allow script aborting
* and reopen session for writing. Function print_error() does terminate the logging too.
*
* Please make sure that each upgrade_log_start() is properly terminated by
* this function or print_error().
*
* This function may be called repeatedly.
*/
function upgrade_log_finish() {
global $CFG, $upgradeloghandle, $upgradelogbuffer, $SESSION;
if (empty($SESSION->upgraderunning)) {
return; // logging already terminated
}
@ob_end_flush();
if ($upgradelogbuffer !== '') {
@fwrite($upgradeloghandle, $upgradelogbuffer);
$upgradelogbuffer = '';
}
if ($upgradeloghandle and ($upgradeloghandle !== 'error')) {
@fclose($upgradeloghandle);
$upgradeloghandle = false;
}
@session_start(); // ignore header errors, we only need to reopen session
$SESSION->upgraderunning = 0; // clear upgrade indicator
if (connection_aborted()) {
die;
}
@ignore_user_abort(false);
}
/**
* Callback function for logging into files. Not more than one file is created per minute,
* upgrade session (terminated by upgrade_log_finish()) is always stored in one file.
*
* This function must not output any characters or throw warnigns and errors!
*/
function upgrade_log_callback($string) {
global $CFG, $upgradeloghandle, $upgradelogbuffer;
if (empty($CFG->disableupgradelogging) and ($string != '') and ($upgradeloghandle !== 'error')) {
if ($upgradeloghandle or ($upgradeloghandle = @fopen($CFG->dataroot.'/upgradelogs/upg_'.date('Ymd-Hi').'.html', 'a'))) {
$upgradelogbuffer .= $string;
if (strlen($upgradelogbuffer) > 2048) { // 2kB write buffer
@fwrite($upgradeloghandle, $upgradelogbuffer);
$upgradelogbuffer = '';
}
} else {
$upgradeloghandle = 'error';
}
}
return $string;
}
/**
* Try to verify that dataroot is not accessible from web.
* It is not 100% correct but might help to reduce number of vulnerable sites.
*
* Protection from httpd.conf and .htaccess is not detected properly.
*/
function is_dataroot_insecure() {
global $CFG;
$siteroot = str_replace('\\', '/', strrev($CFG->dirroot.'/')); // win32 backslash workaround
$rp = preg_replace('|https?://[^/]+|i', '', $CFG->wwwroot, 1);
$rp = strrev(trim($rp, '/'));
$rp = explode('/', $rp);
foreach($rp as $r) {
if (strpos($siteroot, '/'.$r.'/') === 0) {
$siteroot = substr($siteroot, strlen($r)+1); // moodle web in subdirectory
} else {
break; // probably alias root
}
}
$siteroot = strrev($siteroot);
$dataroot = str_replace('\\', '/', $CFG->dataroot.'/');
if (strpos($dataroot, $siteroot) === 0) {
return true;
}
return false;
}
/// =============================================================================================================
/// administration tree classes and functions
// n.b. documentation is still in progress for this code
/// INTRODUCTION
/// This file performs the following tasks:
/// -it defines the necessary objects and interfaces to build the Moodle
/// admin hierarchy
/// -it defines the admin_externalpage_setup(), admin_externalpage_print_header(),
/// and admin_externalpage_print_footer() functions used on admin pages
/// ADMIN_SETTING OBJECTS
/// Moodle settings are represented by objects that inherit from the admin_setting
/// class. These objects encapsulate how to read a setting, how to write a new value
/// to a setting, and how to appropriately display the HTML to modify the setting.
/// ADMIN_SETTINGPAGE OBJECTS
/// The admin_setting objects are then grouped into admin_settingpages. The latter
/// appear in the Moodle admin tree block. All interaction with admin_settingpage
/// objects is handled by the admin/settings.php file.
/// ADMIN_EXTERNALPAGE OBJECTS
/// There are some settings in Moodle that are too complex to (efficiently) handle
/// with admin_settingpages. (Consider, for example, user management and displaying
/// lists of users.) In this case, we use the admin_externalpage object. This object
/// places a link to an external PHP file in the admin tree block.
/// If you're using an admin_externalpage object for some settings, you can take
/// advantage of the admin_externalpage_* functions. For example, suppose you wanted
/// to add a foo.php file into admin. First off, you add the following line to
/// admin/settings/first.php (at the end of the file) or to some other file in
/// admin/settings:
/// $ADMIN->add('userinterface', new admin_externalpage('foo', get_string('foo'),
/// $CFG->wwwdir . '/' . '$CFG->admin . '/foo.php', 'some_role_permission'));
/// Next, in foo.php, your file structure would resemble the following:
/// require_once('.../config.php');
/// require_once($CFG->libdir.'/adminlib.php');
/// admin_externalpage_setup('foo');
/// // functionality like processing form submissions goes here
/// admin_externalpage_print_header();
/// // your HTML goes here
/// admin_externalpage_print_footer();
/// The admin_externalpage_setup() function call ensures the user is logged in,
/// and makes sure that they have the proper role permission to access the page.
/// The admin_externalpage_print_header() function prints the header (it figures
/// out what category and subcategories the page is classified under) and ensures
/// that you're using the admin pagelib (which provides the admin tree block and
/// the admin bookmarks block).
/// The admin_externalpage_print_footer() function properly closes the tables
/// opened up by the admin_externalpage_print_header() function and prints the
/// standard Moodle footer.